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Old 24th May 2011, 09:42 AM   #1791
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Location: Electrostal, Moscow region
Quote:
Originally Posted by Oery View Post
Here's my little project

On power board.
IC: LM3886T
Resistor: (all) Takman 1/2w Metal Film
Capacitor Elc: 3x 100F/50V Elna Cerrafine, 2x 22F/50V Nichicon
Capacitor: 2x 100nF/250V Wima MKP10
Capacitor Coupling (DC Blocking): 2x 1.5F/400V MKP Solen (Original)
Capacitor Power Supply: Nover AudioGrade 4x 6800F/50V
Potentiometer: Alps Blue Beauty
PCB: XY HiFi (Dual Layer Fiber Board)

On tube buffer board (based MF X10D)
Tube: 6BQ7 + Octal Socket
Resistor: Takman Carbon, Allen Bradley, Riken, Standar Metal Film (1% Tolerance)
Capacitor Elc: 2x Panasonic FC Blue 2200F/25V, 8x Nichicon Gold 1000F/35V, 2x Nichicon Muse BP 10F/50V
Capacitor: 4x ERO 220n/250V MKC1862, 2x Soshin 220pF Silver Mica
Capacitor Coupling (DC Blocking): 2x Siemens 3.3F/100V
Capacitor PowerLine Filter: RIFA X2 100nF/275VAC
Diode: 5x Vishay BYV26E Ultra Fast Avalanche Sinterglass Diode
PCB: Lite Audio (Single Layer Fiber Board)

Hope you like it......
Very impressive work, High-End look =)

Last edited by Professor; 24th May 2011 at 09:44 AM.
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Old 24th May 2011, 10:46 AM   #1792
Oery is offline Oery  Indonesia
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Quote:
Originally Posted by Professor View Post
Very impressive work, High-End look =)
thanks

and here is top view
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Old 24th May 2011, 01:05 PM   #1793
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Stylish pictures!!! Very impressive!
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Old 25th May 2011, 11:10 PM   #1794
bbm3 is offline bbm3  United States
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Very clean layout.
Top quality workmanship.
Nice!
-BB
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Old 26th May 2011, 06:54 AM   #1795
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Default New project 3 way active amp.

It contrast to the previous post here's my messy 2nd budget project. I think I need a bigger case to get things tidy !!

Anyway amp includes 4 * lm3886 mono boards bought as pcb's and populated with decent parts.These power the bass and mid range.

HF driven by ready populated lm1875 stereo board.

Trafo 150w and case from defunct Sony surround amp bought off ebay for $20!Trafo runs 30v rails to lm3886 and 15v to lm1875.

Active crossover ESP project 09*2 with separate trafo and self built psu.

Sounds totally brilliant on my 3 way hybrid open baffle speakers. The sound quality stay's clear even when cranked up! Im definitley a convert to the active system.
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Last edited by skodaboy; 26th May 2011 at 07:14 AM.
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Old 27th May 2011, 05:16 AM   #1796
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Unhappy Another Chip Amp build thread

Yes, it's just another Chip Amp build, but it's my chip amp build. And it's my first one, so I'm really happy about it.

  • It's the LM3886 kit from ChipAmp Electronics LLC, a.k.a. ChipAmp.com.
  • The boards are mounted on the back plate, so there is minimal distance from the amplifier boards to in RCA jacks and speaker terminals. This keeps them away from the mains and transformer secondaries. I'm not sure if I would recommend this to anyone. It was very difficult to get the wires soldered into the board.
  • Yes, the heatsinks are small, but I'm using it at moderate volume in a small home office. I would occasionally feel them, and they never felt more than warm. I can always add a fan or two later if needed.
  • I left room on the left side for another power supply and 2 amp boards, and even attached RCA jacks and speakers terminals for when I decide to make it 4-channel bridgeable.
  • The transformer has built-in shielding. Note the purple wire going to the star ground. It should be adequate for another 2 channels.
  • The chassis is a mere 12" X 8" X 3.5" while still leaving room to double the channels. It's such a tight fit I had to file the edges of the PCB's!
  • I keep meticulous records of how much I spend on my audio projects. I've included my spreadsheet so anyone contemplating a similar build can get an idea of how much it will cost.
  • The final verdict: I'm very happy with the sound. The bass is punchy, which others have said they've gotten from chip amps and very crisp, clear sound. It's dead quite too, not a hint of buzz or hum.
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Old 3rd June 2011, 05:51 PM   #1797
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lm 3886
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Too much bass as C rifa (y) 0.0047.
Improved use Rubycon photo-flash 200uf help.
voice is more clear.
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Outside to some minor adjustments, including cylinders C.
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Now ... the sound overall is desirable, may be change about C rifa (y) 4n7
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If the wrong language. I'm sorry.
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Old 3rd June 2011, 06:07 PM   #1798
frank1 is offline frank1  United Kingdom
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Default 450vDC!

What a waste of decent high voltage electrolytics ;-)
Spikes...on an amp? (Ouch! my furniture!)
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Old 3rd June 2011, 06:21 PM   #1799
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Very nice build, and without a PCB! I'm curious: why do you have capacitors across the filtering caps instead of bleeder resistors?
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Old 3rd June 2011, 06:45 PM   #1800
udailey is offline udailey  United States
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His large resistor on the rectifier will serve the same purpose, to bleed off power from the caps.
Many folks 'voice' their system by placing other smaller and usually different brand caps in parallel with their larger caps.
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